How would you describe Lewis Henry Morgan's and Edward Tylor's evolutionary theories?

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Both Lewis Henry Morgan and Edward Tylor studied the history of human society from simple to complex technology and social institutions, which can be seen as an evolutionary progress. Their theories of cultural evolution emphasized the idea that human societies progress from simple to complex forms, and that all societies go through similar stages of development. They believed that the development of society is the result of advances in technology, which lead to new forms of social organization and cultural expression.

How Would You Describe Lewis Henry Morgan's and Edward Tylor's